A Doriathrin adjective for “grey” written heðu in The Etymologies, and derived from the primitive form ᴹ✶khithwa [kʰitʰwa] (Ety/KHIS). This word illustrates several interesting phonetic changes in Ilkorin.
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The [[ilk|[i] became [e] before the final [a]]].
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Both the aspirates became voiceless spirants: [kʰ-] > [x-] and [-tʰ-] > [-θ-].
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Later the [[ilk|initial [x-] became [h-]]].
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Meanwhile the [[ilk|medial [-θ-] voiced to [-ð-]]] (“dh”).
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The [[ilk|primitive final [a] was lost]].
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Afterwards, the resulting [[ilk|final [w] became [u]]].
In most other Doriathrin words, a [[ilk|final [u] from [w] further developed into [o]]]; it is unclear why this change did not occur here.
An adjective for “grey” derived from primitive ᴹ✶thindi (Ety/THIN) because primitive final vowels vanished in Ilkorin.